Reading the limits
The honest boundaries of a two-to-three-month average
Knowing what a reading cannot do is what makes the rest of it trustworthy. Four limits worth understanding before you interpret a single number.
This is the first and largest limit. A hair tissue mineral analysis screens for mineral patterns. It does not diagnose disease, it does not name the cause of a symptom, and it does not replace anything your own licensed provider does.
Used as a screen, it is genuinely useful — subclinical shortfalls are estimated to outnumber frank deficiencies roughly ten to one, and a screening instrument is exactly the right tool for that kind of gap.
Each reading averages roughly two to three months of hair growth. That is a strength and a limit at once.
The strength: a two-month average is not thrown off by one bad night or one unusual meal, which is where a single blood draw can mislead.
The limit: it cannot show you today. If something changed three weeks ago, most of the sample predates it.
This is the most concrete limit in the whole subject, and the evidence is unusually clean. A 22-inch strand was cut into fourteen segments and analysed along its length. Calcium read 27 mg% at the scalp and over 200 mg% at the distal end.
Long hair does not report current status. It reports years of accumulated environmental exposure. That is why the protocol is specific:
A sample taken casually is not a cheaper test. It is a different test, of a different period, and the report cannot tell you that happened.
Samples are analysed unwashed, because washing removes over 90% of sodium and potassium — two of the minerals the core ratios depend on.
Shampoos, conditioners and dyes should be noted on the request form, because they can contribute to the reading. Pubic hair is confirmatory only, and the tell for contamination there is elevated phosphorus.
The limit I explain most often is the time one. People bring me a report and ask why it does not reflect the change they made a fortnight ago. It cannot — most of that sample grew before the change.
The other one I insist on is the scissors and the length. I would rather delay a test than run one on six inches of hair, because the result will look like a real answer and quietly be an answer about several years ago.
No. It is a screening test for mineral patterns. It does not diagnose, and it does not replace assessment by your own licensed provider.
Roughly two to three months of growth, which is why it is read as a pattern rather than a current snapshot.
Because mineral content changes dramatically along the length. In one published example calcium read 27 mg% at the scalp and over 200 mg% at the far end of a 22-inch strand. Only the first 1.5 inches reflects the recent period.
Samples are analysed unwashed. Washing removes over 90% of sodium and potassium, which would distort the ratios those minerals appear in.
The kit includes the collection instructions the laboratory expects, so the reading covers the period you think it covers.
Published 2026-08-30 · Updated 2026-08-30
By Eileen Durfee — Practitioner, NBS (Nutritional Balancing Science), NASM-CPT; wellness educator, inventor and author.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Hair tissue mineral analysis is a screening test and is not diagnostic; anything medical belongs with your own licensed provider. Wellness Shopping Online is operated by Nuco Enterprise Solutions LLC.
