# rakta-dhātu (रक्तधातु)

> Canonical version of this page: https://nighantu.ageayurveda.com/lexicon/rakta-dhatu/

An Ayurvedic technical term, rendered into English in 4 different ways across 6 sources.
The renderings do not agree, and the difference between them changes what the term is taken
to mean.

## Identification

| Field | Value |
| --- | --- |
| Transliteration | rakta-dhātu |
| Devanagari | रक्तधातु |
| Also written | rakta, raktadhatu, shonita, śoṇita, rudhira, asrik |
| Category, as gathered | dhatu |
| Grouped under | Body: tissues, wastes and channels |
| Classical citations | 8 |
| Citations checked | 2026-10-08 |

## How it is translated, and whether the translation holds

Each rendering is given with the source that uses it. The assessment is ours.

### Blood

WHO International Standard Terminologies on Ayurveda · ITA-2.2.5 (Sanskrit: rakta-dhātuḥ, raktam, śoṇitam) · standard

The one dhātu where WHO adopts a plain biomedical English word without hedging. WHO's own description nonetheless contains two non-biomedical claims: that it is formed in liver and spleen, and that its function is 'to give life' (jīvana, ITA-2.2.6).

Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that
licence permits, and deliberately absent from the downloadable dataset, which is CC BY 4.0.

### Giving life

WHO International Standard Terminologies on Ayurveda · ITA-2.2.6 (jīvanam) - the function, listed as a separate headword · standard

WHO gives rakta's defining function its own term ID, which is evidence that the standard treats the functional claim as part of the concept rather than as commentary.

Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that
licence permits, and deliberately absent from the downloadable dataset, which is CC BY 4.0.

### blood

Charaka Samhita, tr. Avinash Chandra Kaviratna (1896-1913) · Sutrasthana XXIV (Vidhi-shonitiya); Chikitsasthana XV · translation

Consistent across the volume, including for śoṇita. Kaviratna does not distinguish rakta from śoṇita in English.

### blood

Sushruta Samhita, tr. Kunja Lal Bhishagratna (1907-1916) · Sutrasthana XIV (titled 'which treats of Blood') and XV · translation

Same. Bhishagratna adds 'life blood' for jīva-śoṇita and 'arterial namesake' when relating ārtava to rakta.

### blood tissue

Modern Ayurvedic journal usage · journal

The source's own wording is not reproduced here: "Modern Ayurvedic journal usage" is not a source this project has cleared for quotation.

The hedged form used when authors want to signal that the equation is an interpretation. The paper quoted explicitly calls it a correlation, not an identity.

### blood, haemoglobin-bearing tissue

Clinical Ayurvedic research usage · PMID 24250128 operationalises raktakshaya as anaemia, measured by Hb, TIBC, serum iron and ferritin · journal · our paraphrase of the source, not its words

The only case in this whole term set where a dhātu has been given an explicit, measurable operational definition in a controlled trial. Worth recording as a rendering because the choice of measure IS a claim about meaning.

## The classical passages

### Charaka Samhita Sutrasthana 24 (Vidhi-shonitiya):3 in Kaviratna's marginal numbering, checked against the source

> Verily, it is pure blood that brings about strength and complexion and (the) happiness (of health) and longevity, for the very life of living creatures is dependant on blood.

tr. Avinash Chandra Kaviratna (1896-1913) · https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt

Charaka's core statement of rakta's function: life itself depends on it. This is the source of the jīvana function WHO gives its own term ID. Chapter located by its heading 'LESSON XXIV ... Vidhi-Sonitiya' in the retrieved file.

### Charaka Samhita Sutrasthana 24:16 in Kaviratna's marginal numbering, checked against the source

> All those diseases that are curable but that cannot be cured by the application of cool, hot, oily, and dry methods of treatment, should be ascribed to diseased blood as their cause.

tr. Avinash Chandra Kaviratna (1896-1913) · https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt

Rakta as a diagnostic residual category: whatever does not answer to doṣa-directed treatment is attributed to blood. A striking piece of clinical reasoning that gets no mention in the usual 'rakta = blood' gloss.

### Sushruta Samhita Sutrasthana 14 (Shonita-Varnaniya):prose, 'Authoritative verses on the subject', checked against the source

> The Rasa or the lymph chyle, coloured through the effect of the healthy normal dyeing heat of the body, obtains the name of blood.

tr. Kunja Lal Bhishagratna (1907-1916) · https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt

That rakta is defined by acquisition of colour from rasa, i.e. by a transformation, not by composition. Sushruta places the colouring in spleen and liver.

### Sushruta Samhita Sutrasthana 14:prose, metrical texts, checked against the source

> In blood the properties such as, a raw or fleshy smell, fluidity, redness, lightness and mobility, which respectively characterise the fundamental principles (of earth, water, fire, air, and sky) are to be found thus representing those specific elements in its composition.

tr. Kunja Lal Bhishagratna (1907-1916) · https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt

Rakta as pāñcabhautika, with each of five observable properties assigned to one mahābhūta. The nearest thing in the sources to a compositional analysis of a dhātu.

### Sushruta Samhita Sutrasthana 14:prose, checked against the source

> The blood in its healthy and natural state is possessed of a vivid red colour like that of an Indragopa (Cochineal) insect, and is neither too thin nor too transparent.

tr. Kunja Lal Bhishagratna (1907-1916) · https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt

A purely observational normality criterion for rakta, based on colour and consistency. Contrasts with modern operationalisation by haemoglobin.

### Sushruta Samhita Sutrasthana 15 (Dosha-Dhatu-Mala-Kshaya-Vriddhi-Vijnaniya):corresponds to mula verse 5, checked against the source

> The blood, in its turn, increases the healthful glow of the complexion, leads to the increased formation of flesh and muscles and maintains vitality in the organism.

tr. Kunja Lal Bhishagratna (1907-1916) · https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt

Rakta's three functions: complexion (varṇa-prasāda), nourishment of mamsa, and maintenance of life. The Sanskrit of this verse was verified separately: रक्तं वर्णप्रसादं मांसपुष्टिं जीवयति च.

### Sushruta Samhita Sutrasthana 15:kshaya and vriddhi prose sections, checked against the source

> The loss of blood is attended with such symptoms as roughness of the skin, and a craving for acid food or drink. The patient longs to be in a cool place and asks for cool things, and the veins become loose and flabby. ... A plethora of blood in the system gives a reddish glow to the complexion and the white of the eyes, and imparts fullness to the veins.

tr. Kunja Lal Bhishagratna (1907-1916) · https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt

The classical clinical signs of raktakshaya and raktavriddhi. Note these are not the signs of anaemia and polycythaemia; the craving for acid and for cool places has no biomedical counterpart, which is precisely the point at issue when 'rakta' is operationalised as haemoglobin.

### Sushruta Samhita (Sanskrit mula) Sutrasthana 14:10, checked against the source

> रसाद्रक्तं ततो मांसं मांसान्मेदः प्रजायते । मेदसोऽस्थि ततो मज्जा मज्ज्ञः शुक्रं तु जायते ॥१०॥

Sanskrit mūla · https://www.siva.sh/sushruta-samhita/sutra-sthana/14/10

Rakta's place in the chain, from rasa and yielding mamsa, in verified Sanskrit with verse number.

## Where this term does work in the theory

One concept record names this term as one of its components, and glosses it there as follows.

- **[Tridosha: vata, pitta and kapha as the regulatory principles of the body](https://nighantu.ageayurveda.com/concept/tridosha-theory/)** (as Rakta): Blood, counted by Sushruta as a fourth co-determinant of the body's origin, maintenance and dissolution alongside the three doshas

## Not to be confused with

- **śoṇita.** Treated as a synonym by WHO ISTA (both listed under ITA-2.2.5) and by both public-domain translators, who render both as 'blood'. But śoṇita is also WHO's Sanskrit for menstrual blood at ITA-2.3.3, so the synonymy is not clean and an index will mis-merge.
- **ārtava.** Menstrual blood, classed as an upadhātu of rasa by WHO (ITA-2.3.3). Bhishagratna writes that ārtava 'is endued with the same properties as its arterial namesake', so the sources themselves relate them closely while keeping them distinct.
- **rasa.** The precursor. Rakta is rasa that has acquired colour. Translating rasa 'plasma' and rakta 'blood' inverts the relation, since plasma is part of blood rather than its antecedent.
- **pitta.** Pitta is the kiṭṭa (waste fraction) of rakta according to Charaka Chikitsasthana 15, and rañjaka pitta is the agent that colours rasa into rakta. Closely coupled but categorically a doṣa, not a dhātu.
- **raktavaha srotas.** The channel system, not the substance. Diseases are attributed to the srotas as well as to the dhātu and the distinction matters for coding.
- **jīva-śoṇita.** 'Life blood' in Bhishagratna, flagged in the retrieved text as a distinct topic to be treated separately. Not simply rakta.

## Renderings that do not hold

- blood, taken as identical with the biomedical referent. The word is right and the concept is not coextensive. Classical rakta is formed in spleen and liver from rasa, has fleshy smell listed as its earthy property, and its depletion presents as craving for sour food and for cool places. None of that is a statement about haemoglobin.
- haemoglobin / red cell mass. Introduced by operational convenience in clinical research (see PMID 24250128). No classical source supports the narrowing, and it silently discards the complexion and mamsa-nourishing functions that Sushruta gives as rakta's defining work.
- the humour of blood. Imports the Greek humoral scheme, in which blood IS one of the four humours. In Ayurveda blood is a dhātu and not a doṣa, and the confusion is made worse by Bhishagratna's own chapter-heading language about 'humoral constituents'.

## Open questions

Recorded rather than resolved.

- Whether rakta and śoṇita are true synonyms or carry a distinction (e.g. śoṇita for extravasated or menstrual blood) is not settled by anything retrieved; WHO lists śoṇitam under both rakta-dhātu and ārtava.
- The trial evidence (PMID 24250128) assumes rather than tests the rakta/anaemia equation. No retrieved study asks whether patients meeting classical raktakshaya criteria are the same patients as those meeting anaemia criteria. That would be a straightforward and unperformed study.
- Whether Sushruta's attribution of rakta formation to spleen and liver reflects observation or inference is not addressable from the translation alone.
- Charaka Sutrasthana 24's residual-category rule (anything curable but unresponsive to cool/hot/oily/dry treatment is blood-caused) has no modern discussion that this search located.

## Citation

Age Ayurveda Nighantu, "rakta-dhātu", https://nighantu.ageayurveda.com/lexicon/rakta-dhatu/, CC BY 4.0.
Whole lexicon: https://nighantu.ageayurveda.com/lexicon.json and https://nighantu.ageayurveda.com/lexicon.csv.

Educational reference only. A term entry explains what a word means and how it has been
translated. Nothing here is advice.