Porphyrins Screen (Urine)

What is the Porphyrins Screen (Urine)?

The Porphyrins Screen (Urine) measures porphyrins and their precursors excreted in urine. Porphyrins are compounds involved in the production of heme, a critical component of haemoglobin and other essential proteins.

Abnormal accumulation of porphyrins can indicate porphyria, a group of rare metabolic disorders affecting heme synthesis. Urine testing is particularly useful because excess porphyrins are often excreted during active or symptomatic phases.

This screen is commonly used as a first-line investigation when porphyria is suspected based on symptoms or family history.

Why do I need a test for Porphyrins (Urine)?

Porphyria can cause vague, episodic, and often severe symptoms that are difficult to diagnose without targeted testing. The urine porphyrins screen helps identify biochemical abnormalities that explain these symptoms.

Testing is especially important when symptoms are recurrent, unexplained, or triggered by medications, hormones, fasting, or illness.

You may benefit from this test if you experience:

• Severe or recurrent abdominal pain

• Unexplained neurological symptoms

• Peripheral nerve pain or weakness

• Sensitivity to sunlight with skin blistering

• Dark or reddish urine

• Episodes triggered by stress or medication

• Family history of porphyria

• Unexplained psychiatric or cognitive symptoms

Benefits of the Porphyrins Screen (Urine)

1. Supports detection of porphyria
   Identifies abnormal porphyrin excretion patterns.

2. Assists investigation of unexplained symptoms
   Useful when standard tests fail to identify a cause.

3. Non-invasive diagnostic approach
   Requires only a urine sample.

4. Detects active metabolic disturbance
   Particularly helpful during symptomatic episodes.

5. Guides further specialist testing
   Helps determine need for genetic or plasma studies.

6. Supports family risk assessment
   Useful when porphyria is suspected genetically.

7. Helps avoid trigger exposure
   Early detection supports safer medication and lifestyle choices.

8. Improves diagnostic clarity
   Reduces delays in diagnosing rare metabolic disorders.

Step-by-step – how we offer Porphyrins Screen (Urine) testing

Clinic-based testing (UK-wide)

• Choose your nearest UK clinic

• Attend your appointment

• Provide a urine sample following instructions

• Sample is sent to the laboratory for analysis

At-home or hotel testing (+£60)

• A clinician or phlebotomist visits your home or hotel

• Urine sample collected at your location

• No clinic visit or travel required

Both services are available UK-wide.

Your Porphyrins Screen (Urine) results explained

Normal porphyrin levels

Normal results indicate no significant excess porphyrin excretion. This makes active porphyria unlikely at the time of testing.

Symptoms may still require further investigation if they persist or fluctuate.

UK reference interpretation:

• Normal: Within laboratory reference ranges

Elevated porphyrin levels

Raised porphyrins suggest disruption in heme synthesis and may indicate a form of porphyria or secondary porphyrin elevation due to liver disease, alcohol use, or medication effects.

Further testing is often required to identify the specific type.

UK reference interpretation:

• Elevated: Above reference ranges

Markedly abnormal results

Significantly raised porphyrins strongly suggest active porphyria, particularly if symptoms are present. This warrants specialist referral and confirmatory testing.

UK reference interpretation:

• Markedly raised: Significantly above reference ranges