What initial investigations should I consider for a patient presenting with suspected obstructive sleep apnea?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 22 August 2025Updated: 22 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Consider offering home respiratory polygraphy to people with suspected OSAHS.

If access to home respiratory polygraphy is limited, consider home oximetry for people with suspected OSAHS, but be aware that oximetry alone may be inaccurate in people with heart failure or chronic lung diseases.

Consider respiratory polygraphy or polysomnography if oximetry results are negative but the person has significant symptoms.

Consider hospital respiratory polygraphy if home testing is impractical or additional monitoring is needed.

Use the results of the sleep study to diagnose OSAHS and determine its severity (mild, moderate, or severe).

Related Knowledge Topics

Educational content only. Always verify information and use clinical judgement.