Manganese in blood; deficiency or intoxication.

Serum sodium; fluid and osmolality.

Nicotine in blood; recent use.

Nickel in blood; exposure or allergy.

Estradiol (E2); hormonal status.

Omega-3 fatty acids; EPA, DHA and Omega-3 Index in red blood cells.

Parvo B19 IgG; immunity due to previous infection.

PFOA in blood; exposure assessment.

PFOS/PFAS in blood; exposure assessment.

EBV serology; recent or past infection.

Pregnenolone; precursor of steroid hormones.

Progesterone; cycle or pregnancy.

Pro‑insulin; production and insulin resistance.

Prolactin; hyper- or hypoprolactinemia.

Prostate-specific antigen; prostate status.

Serology for acute Q fever.

Serology for chronic Q-fever.

IGRA for latent or active TB.

Immature red blood cells; bone marrow activity.

Reverse T3; metabolic status and disease.

Reverse T3 and free T3; supplementary thyroid diagnostics.

Selenium; thyroid and antioxidant enzymes.

SHBG; binding of testosterone and estradiol.

sTfR; for iron deficiency versus inflammation.