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Why we retest every 90 days

Dr. Nina Ross, ND; Ph.D · 7:12 · The programs
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April 21, 2026 · Medically reviewed by Dr. Nina
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The short answer

Ninety days is not arbitrary. It is roughly how long a red blood cell lives, how long a follicle takes to develop, and how long a real change needs before the numbers can honestly reflect it.

What Dr. Nina covers

Almost everyone wants to retest at six weeks, and I understand why. You have changed a lot, you feel different, and you want the paper to say so.

In this one Dr. Nina explains why ninety days is the honest interval, what actually moves in that window, what does not, and how retesting changes a plan rather than just grading it.

Ninety days is long enough for the numbers to tell the truth and short enough to change course.

Ninety days is long enough for the numbers to tell the truth and short enough to change course.

The Nina Ross Functional Medicine studio in Atlanta
Ninety days is long enough for a plan to prove itself and short enough to correct.

,the first consult sets the baseline everything gets measured against.

Take this with you
01Ninety days matches red cell turnover, follicle development, and thyroid settling time.
02A six week ferritin usually shows very little and discourages people for no reason.
03Symptoms move before labs do, so we track both rather than waiting on paper.
04Retesting tells us which part of the plan did the work, which is how the next one gets shorter.
Dr. Nina Ross, ND; Ph.D
Nina Ross, ND; Ph.D
Naturopathic doctor · Board-certified trichologist · Atlanta

Dr. Nina reads the full panel, connects it to how you actually feel, and builds the plan from there. She sees patients in Atlanta and virtually worldwide.

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Why we retest every 90 days | Nina Ross Functional Medicine