The department of biochemistry offers a diagnostic and advisory service to the local and wider health economy. The department provides a comprehensive range of routine tests, some of which are available 24 hours a day. More specialist tests are also available.

Pathology services at Epsom and St Helier Hospitals are part of South West London Pathology (SWLP), a network of pathology services which serve Kingston, Croydon and St George’s Hospitals, as well at Epsom and St Helier.

Find out more about biochemistry services at SWLP

The biochemistry laboratories use the latest technology for processing chemistry samples. We can perform a wide repertoire of blood, serum and urine analysis and offer one of the most extensive testing services in London.

Among many others, we provide analyses on:

  • vitamins
  • hormones
  • trace metals
  • lipids
  • tumour markers
  • drugs
  • poisons

These tests provide important diagnosis for patients and can indicate whether they have a number of conditions, including:

  • diabetes
  • cancer
  • liver damage or disease
  • bone and kidney disease

We have expertise in providing a fast and efficient service with the ability to deliver results electronically, providing instant access to results. We can also perform multiple tests from a single sample, saving time and resources.

We offer an extensive catalogue of tests with access to experienced clinicians offering clinical advice and interpretation.

See the full list of biochemistry tests


South West Thames newborn bloodspot screening service

The South West Thames newborn bloodspot screening laboratory provides screening for rare congenital, usually inherited, disorders using a bloodspot sample. The laboratory follows guidelines produced by the UK newborn screening programme centre.

Find out more about the newborn bloodspot screening programme on GOV.UK


Clinical services

Clinicians from the department operate clinics at St Helier and Epsom hospitals for management of lipid disorders and renal stones.


Senior members of staff are involved in training and education of postgraduate and undergraduate students both within the trust and in academic units in the south east.


Location and opening hours

St Helier Hospital: first and third floors, D block Monday - Friday from 8am - 5.30pm and Saturdays from 9am - 12.30pm

Epsom Hospital: first floor, Headley Wing Monday - Friday from 9am - 5.30pm and Saturdays from 9am - 12.30pm

Emergency cover is maintained at all other times, including 'on call' consultant cover. 'On call' staff may be contacted by calling 020 8296 2000 (St Helier) or 01372 735735 (Epsom).

Contact details

St Helier laboratory enquiries

Tel: 020 8296 2825 Email:

For direct clinical and specialist assay queries you can call our Duty Biochemist on 07975 232440.

This will be answered during normal working hours by one of the senior medical or scientific staff in the laboratory.

Epsom laboratory enquiries

Tel: 01372 735258 Email:


Key staff


Dr Nikhil Johri, Consultant in Chemical Pathology and Clinical Lead Tel: 020 8296 2660 Email:

Dr Mehdi Mirzazadeh, Consultant in Metabolic Medicine and Chemical Pathology and Laboratory Director of Newborn Screening laboratory Tel: 020 8296 2661 Email:

Dr Rashim Salota, Consultant in Chemical Pathology Tel: 020 8296 2432 Email:

Helen Johnstone, Consultant Clinical Scientist Tel: 020 8296 2658 Email:


Scientific and Technical

Keyna Mendonca, Interim Service Manager – Clinical Blood Sciences Tel: 020 8296 3360 (St Helier) or 01372 735735 ext 6105 (Epsom) Email:

Tom Walton, Scientific Lead – Biochemistry Automation Tel: 020 8296 3360 (St Helier) or 01372 735735 ext 6105 (Epsom) Email:

Aminur Miah, Technical Lead - Special Chemistry Tel: 020 8296 3360 Email

Joshua Ssali, Scientific Lead – South West Thames Newborn Screening Laboratory Tel: 020 8296 2991 Email:

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