Thymine

ChemistryAlso known as: 5-Methyluracilmmol/mol creatinine

Measures thymine levels in blood as a marker of DNA metabolism.

Normal Range
0 – 0
mmol/mol creatinine
Abnormal Levels
< 0 mmol/mol creatinine
> 0 mmol/mol creatinine
Specimen Type
Blood

Why This Biomarker Matters

Elevated thymine levels are rare but may indicate inborn errors of nucleotide metabolism. This test is part of comprehensive metabolic screening to identify rare genetic disorders affecting development and metabolism.

Optimal Ranges

Clinician-defined 4-point reference thresholds (mmol/mol creatinine)

Default Range

0
0
0
0
Low
0 mmol/mol creatinine
Borderline Low
0 mmol/mol creatinine
Optimal
0 mmol/mol creatinine
Borderline High
0 mmol/mol creatinine

Overview

Thymine is a nucleobase (building block of DNA) that normally circulates at very low levels in the bloodstream. Elevated thymine levels can indicate rare metabolic disorders affecting nucleotide metabolism or clearance. This test may be ordered as part of specialized metabolic screening in patients with developmental delays, microcephaly, or other metabolic symptoms. Elevated thymine is uncommon and requires interpretation alongside other metabolic markers and clinical findings.

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

75121-4Primary
Thymine [Moles/volume] in Serum or Plasma
nmol/L
75153-7
Thymine [Moles/volume] in Cerebral spinal fluid
nmol/L

Available Lab Tests

Order tests that measure this biomarker

Urinary Organic Acids

$586.08
Results in 7-14 business days