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Also reported in: mmol/mol creatinine
Normal kryptopyrrole levels below 10 mcg/dL are accepted as not clinically significant for pyroluria. While some HPL excretion is normal from heme synthesis, this level does not cause significant ongoing B6 and zinc depletion. Note that kryptopyrrole testing is primarily used in integrative and functional medicine — it is not a standard laboratory test in conventional medicine.
Kryptopyrroles (HPL — hydroxyhemopyrrolin-2-one) are metabolic waste products from hemoglobin synthesis that, when elevated, bind to and deplete vitamin B6 and zinc from the body before they can be used. Undetectable HPL means no significant pyrrole waste is forming or being excreted. This is the ideal result and indicates normal heme metabolism without this form of nutrient depletion.
Excellent result. No pyrrole-mediated B6 or zinc depletion occurring.
Kryptopyrroles (HPL): {{value}} {{unit}} — undetectable (ref: <{{high}})Very low kryptopyrroles indicate minimal pyrrole excretion and negligible pyrrole-mediated depletion of vitamin B6 and zinc. Normal heme synthesis occurs with minimal waste product accumulation. This is a reassuring result for pyrrole disorder (pyroluria).
Good result. No pyrrole disorder concern.
Kryptopyrroles (HPL): {{value}} {{unit}} — very low (ref: <{{high}})Low normal HPL levels mean pyrrole waste products from heme metabolism are being excreted in small but acceptable quantities. At this level, B6 and zinc depletion from pyrroles is negligible. This result is well within the healthy range.
No action needed. Normal pyrrole level.
Kryptopyrroles (HPL): {{value}} {{unit}} — low normal (ref: <{{high}})Normal kryptopyrrole levels below 10 mcg/dL are accepted as not clinically significant for pyroluria. While some HPL excretion is normal from heme synthesis, this level does not cause significant ongoing B6 and zinc depletion. Note that kryptopyrrole testing is primarily used in integrative and functional medicine — it is not a standard laboratory test in conventional medicine.
Normal result. Maintain adequate dietary B6 and zinc intake.
Kryptopyrroles (HPL): {{value}} {{unit}} — normal (ref: <{{high}})Optimal HPL below 5 mcg/dL indicates very low pyrrole waste production with essentially no meaningful impact on B6 and zinc status. Normal heme synthesis is occurring efficiently without accumulating these metabolic waste byproducts.
Excellent result. No pyrrole disorder concern.
Kryptopyrroles (HPL): {{value}} {{unit}} — optimal (ref: <5)Borderline elevated HPL between 10 and 20 mcg/dL indicates mild pyroluria. At this level, there is measurable ongoing depletion of vitamin B6 and zinc bound to the pyrrole waste products being excreted in urine. B6 and zinc are critical cofactors for GABA synthesis, serotonin synthesis, immune function, and stress hormone regulation. Mild pyroluria can contribute to anxiety, poor stress tolerance, mood instability, and learning difficulties.
Discuss with a practitioner familiar with pyroluria. Targeted B6 (P5P form) and zinc supplementation at moderate doses is the typical intervention. Avoid forms of stress that worsen pyrrole production.
Kryptopyrroles (HPL): {{value}} {{unit}} — borderline elevated (ref: <{{high}}; borderline: 10–20)Elevated kryptopyrroles in the 20–40 mcg/dL range indicate moderate pyroluria — a metabolic condition where excess pyrrole waste binds and removes significant quantities of B6 and zinc from the body daily. This ongoing depletion leads to chronic deficiency of two of the most critical mental health nutrients. B6 is required for serotonin, dopamine, GABA, and kynurenine pathway regulation. Zinc is essential for synaptic function, neuroplasticity, and immune defense. Together, this depletion pattern is associated with anxiety, depression, poor emotional regulation, learning difficulties, sensory sensitivity, and poor stress tolerance.
Work with a practitioner knowledgeable in pyroluria management. High-dose P5P (active B6) and zinc supplementation tailored to body weight and severity is the primary treatment. These nutrients must be replenished continuously as long as pyroluria persists. Monitoring levels and B6/zinc serum status helps guide dosing.
Kryptopyrroles (HPL): {{value}} {{unit}} — elevated — moderate pyroluria (ref: <{{high}}; elevated: 20–40)Very high HPL above 40 mcg/dL represents noticeable pyroluria with very significant ongoing depletion of B6 and zinc daily. At this level, clinical manifestations are typically pronounced — significant anxiety, depression, emotional dysregulation, poor stress resilience, recurrent infections from immune impairment, white spots on nails (zinc depletion sign), loss of smell (zinc), morning nausea, and sensitivity to light and sound. noticeable pyroluria has been described in clinical populations with schizophrenia, bipolar disorder, autism spectrum, and treatment-resistant depression.
Immediate and sustained supplementation with P5P and zinc under practitioner supervision is needed. The doses required at this severity are above standard supplement doses and need individualized management. Regular retesting of pyrroles and zinc/B6 levels guides treatment optimization.
Kryptopyrroles (HPL): {{value}} {{unit}} — very high — noticeable pyroluria (ref: <{{high}}; critical: >40)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.