Saliva vs blood hormone testing
Choose serum or dried blood spot for reliable estradiol monitoring.
Written by the Kindr Health Editorial & Clinical TeamMedically reviewed by Kindr Health Clinical Team NPI 1609792902Published Last reviewed
Serum
Gold standard. Correlates with dose. Preferred for transdermal estradiol titration.
Saliva
Free-fraction only, high assay variability, not validated for pellet or oral HRT.
Considering a physician-supervised longevity protocol? Kindr Health evaluates peptide therapy as part of personalized perimenopause and menopause care.
Request your Longevity Consult →Explore Kindr Health
Related: FDA peptide review July 2026 briefing · Peptide therapy hub · Longevity service
Written and medically reviewed by the Kindr Health Clinical Team · Published 2026-06-19 · Last reviewed 2026-07-01. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products.