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When the standard tests come back normal.

Long COVID, ME/CFS, MCAS, POTS — and the proteins driving symptoms your doctor can't see.

AllLong COVIDME/CFSMCASPOTSLab scienceTesting
MCASTesting
June 17, 2026 · 5 min read

Histamine Intolerance and MCAS: What Testing Can and Cannot Tell You

A mast cell activation syndrome test and a histamine intolerance test have real limits. What DAO, histamine, and tryptase testing can and cannot tell you.

MCASLab science
May 21, 2026 · 5 min read

Mast Cells and Cytokines: The Inflammatory Signaling Picture

Mast cells cytokines work both ways: mast cells release TNF and IL-6 and respond to them. What a broad inflammation panel can and cannot measure.

MCASTesting
April 20, 2026 · 5 min read

MCAS Testing: What the Standard Workup Covers and What It Misses

An MCAS test is not one blood result. What serum tryptase and urinary mediators cover, why they miss flares, and what inflammation data adds as context.

MCASLong COVIDME/CFS
March 2, 2026 · 5 min read

MCAS Symptoms: Why They Overlap With Long COVID and ME/CFS

MCAS symptoms are multi-system and episodic, overlapping closely with long COVID and ME/CFS. Why the conditions share biology and often coexist.

Showing 4 posts tagged “MCAS”. Clear filter