Retrieving Unique Rows

I have the following sql:

SELECT DISTINCT patient.patientID, patientFirstName, patientLastName, patientDOB, patientGender, completed_date
FROM patient
LEFT JOIN patient_record ON patient_record.patientID = patient.patientID
WHERE (sub_categoryID = 4 OR patient_record.allocated = 4)
AND (patient_status = 1 OR patient_status = 2 OR patient_status = 5)
GROUP BY patient.patientID, patientFirstName, patientLastName, patientDOB, patientGender, completed_date

This brings up duplicate records, my aim is to bring distinct records, now if I take out the other returned fields after patientID
and using the following sql:

SELECT DISTINCT patient.patientID
FROM patient
LEFT JOIN patient_record ON patient_record.patientID = patient.patientID
WHERE (sub_categoryID = 4 OR patient_record.allocated = 4)
AND (patient_status = 1 OR patient_status = 2 OR patient_status = 5)
GROUP BY patient.patientID

This bring up distinct results, but I need to retrieve the other fields from the database i.e. patientFirstName and patientLastName

Please can you help.