= UseCase06 - Doctor Requests Lab Test =

== Initiating Actor - `Doctor` ==


== Description ==
A doctor requests a laboratory test for a patient. The system creates a performed lab test record linking the doctor, patient, and the specific test.

== Scenario ==

1. Doctor opens a patient's medical record.

{{{
#!sql
SELECT
  mr.record_id,
  mr.patient_id
FROM medical_records mr
WHERE mr.patient_id = (
  SELECT patient_id FROM users WHERE username = 'maja.veljanova'
);
}}}

2. System displays all available lab tests.

{{{
#!sql
SELECT
  lt.test_id,
  lt.test_name,
  lt.description,
  lt.cost
FROM lab_tests lt
ORDER BY lt.test_name;
}}}

3. Doctor selects a lab test, specifies the test date and notes, and submits the request.

{{{
#!sql
INSERT INTO performed_lab_tests (patient_id, doctor_id, test_id, test_date, notes)
VALUES (
  (SELECT patient_id FROM users WHERE username = 'maja.veljanova'),
  (SELECT doctor_id FROM users WHERE username = 'elena.kirova'),
  (SELECT test_id FROM lab_tests WHERE test_name = 'Complete Blood Count'),
  '2026-06-05',
  'Blood work for hypertension monitoring'
)
RETURNING performed_test_id;
}}}

4. System calculates the total cost of lab tests performed on that date for this patient.

{{{
#!sql
SELECT SUM(lt.cost) AS total_cost
FROM performed_lab_tests plt
JOIN lab_tests lt ON plt.test_id = lt.test_id
WHERE plt.patient_id = (
SELECT patient_id 
FROM users 
WHERE username = 'maja.veljanova')
  AND plt.test_date = '2026-06-05';
}}}

5. System creates a billing record for the patient.

{{{
#!sql
INSERT INTO billing (total_cost, payment_status, record_id, admin_id)
VALUES (
  75.00,
  'PENDING',
  (SELECT record_id FROM medical_records WHERE patient_id = (SELECT patient_id FROM users WHERE username = 'maja.veljanova')),
  (SELECT admin_id FROM admin LIMIT 1)
)
RETURNING bill_id;
}}}

6. System links the billing record to the performed lab test.

{{{
#!sql
INSERT INTO billing_lab_tests (bill_id, test_id)
VALUES (
  (SELECT MAX(bill_id) FROM billing),
  (SELECT test_id FROM lab_tests WHERE test_name = 'Complete Blood Count')
);
}}}

7. System confirms the request and displays all pending lab tests for the patient.

{{{
#!sql
SELECT
  plt.performed_test_id,
  lt.test_name,
  plt.test_date,
  plt.notes
FROM performed_lab_tests plt
JOIN lab_tests lt ON plt.test_id = lt.test_id
WHERE plt.patient_id = (
SELECT patient_id 
FROM users 
WHERE username = 'maja.veljanova');
}}}