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Contact the study team using the details below to take part. If there are no contact details below please ask your doctor in the first instance.

Contact Information:

Hannah Howlett
Hannah.Howlett@nca.nhs.uk


Miss Marie Meehan
marie.meehan@nca.nhs.uk


Helena Tattersall
helena.tattersall@nca.nhs.uk


Fatma Rumash
Fatma.Rumash@nca.nhs.uk


Karolina Stepien
karolina.stepien@nca.nhs.uk


Mary Gieschen-Krische
mary.gieschenkrische@nca.nhs.uk


Helen Moffitt-Adams
helen.moffitt@nca.nhs.uk


Study Location:

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Be Part of Research - Trial Details - Phe levels over menstrual cycle in PKU

Phe levels over menstrual cycle in PKU

Recruiting

Open to: Female

Age: 16 Years - 40 Years

Medical Conditions

Metabolic disorders


This information is provided directly by researchers, and we recognise that it isn't always easy to understand. We are working with researchers to improve the accessibility of this information. In some summaries, you may come across links to external websites. These websites will have more information to help you better understand the study.


Blood phenylalanine (Phe) levels are likely to change during the monthly period in women with PKU. We want to study this because some women report that when they started their period changes in Phe resulted in questions about adherence to the low protein diet. Women undergoing sapropterin testing have reported changes in Phe during their period which has complicated decisions around responsiveness.
We propose a feasibility pilot study recruiting 10 women aged under 40 years old from the metabolic unit at Salford Royal Hospital, Northern Care Alliance NHS Foundation Trust. Women will be asked to complete a diary of their period for two months which will help decide the best days to plan tests for hormone and Phe levels. Hormone and Phe levels will be tested at specifically chosen time points during the different parts of the period (menstrual cycle), for 3 cycles to ensure we have representative results. Participants will be asked to complete a diary to check that any changes in Phe levels are not related to appetite or diet.
We will also complete a questionnaire study to find out whether and how periods have impacted on women’s experiences of having PKU.

Start dates may differ between countries and research sites. The research team are responsible for keeping the information up-to-date.  

The recruitment start and end dates are as follows:

18 Feb 2026 30 Dec 2026

Observational

Observational type: Case-controlled study;



You can take part if:



You may not be able to take part if:


• Not on combined oral contraceptive pill, no coil fitted or on any other treatment which could affect female hormone levels e.g. anti-psychotic or anti-epileptic medication. • If just stopped oral contraceptive pill must have 2 natural cycles after stopping. • Has any condition such as polycystic ovary syndrome that could affect hormone levels. • Not on sapropterin to avoid the possibility of sapropterin induced variation within the sample. Women on sapropterin may have reduced variation of blood Phe levels. • Hyperphenylalaninaemia • Intensive physical activity (more than 30minutes daily in case of high intensity and 4 hours daily in case of low intensity activity) • Pregnancy, post menopause


Below are the locations for where you can take part in the trial. Please note that not all sites may be open.

  • Salford Royal
    Salford
    Greater Manchester
    M6 8HD
  • Royal Oldham Hospital
    Oldham
    Lancashire
    OL1 2JH
  • Fairfield General Hospital
    Bury
    Lancashire
    BL9 7TD
  • Rochdale Infirmary
    Rochdale
    Lancashire
    OL12 0NB

Hannah Howlett
Hannah.Howlett@nca.nhs.uk


Mary Gieschen-Krische
mary.gieschenkrische@nca.nhs.uk


Helen Moffitt-Adams
helen.moffitt@nca.nhs.uk


Helena Tattersall
helena.tattersall@nca.nhs.uk


Fatma Rumash
Fatma.Rumash@nca.nhs.uk


Karolina Stepien
karolina.stepien@nca.nhs.uk


Miss Marie Meehan
marie.meehan@nca.nhs.uk



The study is sponsored by NORTHERN CARE ALLIANCE NHS FOUNDATION TRUST and funded by THE NATIONAL SOCIETY FOR PHENYLKETONURIA (UNITED KINGDOM) LIMITED .




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for Trial ID: CPMS 70773

Last updated 11 March 2026

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