Optimal Result: 0 - 0.8 mmol/mol creatinine.

4-hydroxyphenyllactate is a tyrosine metabolite. Tyrosine is an amino acid. Amino acids are the building blocks of protein. The body makes tyrosine from another amino acid called phenylalanine.

Among other food items, tyrosine can also be found in:

- meats,

- fish,

- eggs,

- dairy products (cheeses, etc). 

4-hydroxyphenyllactate is present in relatively higher concentrations in the cerebrospinal fluid and urine of patients with phenylketonuria (PKU) and tyrosinemia.

What is phenylketonuria (PKU)?

Phenylketonuria (commonly known as PKU) is an inherited disorder that increases the levels of a substance called phenylalanine in the blood. Phenylalanine is a building block of proteins (an amino acid) that is obtained through the diet.

What is tyrosinemia?

Tyrosinemia is a genetic disorder characterized by disruptions in the multistep process that breaks down the amino acid tyrosine, a building block of most proteins. If untreated, tyrosine and its byproducts build up in tissues and organs, which can lead to serious health problems.

4-hydroxyphenyllactic acid is often used to help diagnose rare genetic metabolic disorders. 4-hydroxyphenyllactic acid can sometimes be also slightly elevated in other conditions or due to intake of tyrosine-rich foods.

What does it mean if your 4-Hydroxyphenyllactic result is too high?

Increased values are commonly associated with tyrosinemias, which can result from immature development of enzyme synthesis in infants or genetic deficiencies. 

What is tyrosinemia?

Tyrosinemia is a genetic disorder characterized by disruptions in the multistep process that breaks down the amino acid tyrosine, a building block of most proteins. If untreated, tyrosine and its byproducts build up in tissues and organs, which can lead to serious health problems.

Increased levels can also be associated to phenylketonuria.

What is phenylketonuria (PKU)?

Phenylketonuria (commonly known as PKU) is an inherited disorder that increases the levels of a substance called phenylalanine in the blood. Phenylalanine is a building block of proteins (an amino acid) that is obtained through the diet.

Slight increases may be due to the following:
- increased tyrosine intake (red meat, pork, fish, dairy, cheese) 
- bacterial gut metabolism/ bacterial overgrowth, 
- short bowel syndrome, 
- or liver disease/ damage. 
- severe malaria

Our database has science-based research on 1500+ biomarkers.

10 000+ happy clients
100% satisfaction
★★★★★ customer support

Essential Plan


  • Monthly subscription
  • Instant interpretation
  • Use the free self-upload form
  • Additional charge for upload service
  • 1500+ biomarkers explained
  • Recommendations
  • Cancel anytime

Advanced Plan


  • Yearly subscription
  • Instant interpretation
  • We upload five reports for you
  • Use the free self-upload form
  • 1500+ biomarkers explained
  • Nutrition Recommendations
  • Online support
  • Cancel anytime

Own It For Life premium plan


  • No subscription
  • Unlimited access
  • Unlimited storage
  • Instant interpretations
  • We upload ten reports for you
  • Use the free self-upload form
  • 1500+ biomarkers explained
  • Nutrition Recommendations
  • Dedicated support

We implement proven measures to keep your data safe.

At HealthMatters, we're committed to maintaining the security and confidentiality of your personal information. We've put industry-leading security standards in place to help protect against the loss, misuse, or alteration of the information under our control. We use procedural, physical, and electronic security methods designed to prevent unauthorized people from getting access to this information. Our internal code of conduct adds additional privacy protection. All data is backed up multiple times a day and encrypted using SSL certificates. See our Privacy Policy for more details.

General Data Protection Regulation (GDPR). HIPAA compliance for healthcare professionals