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public class PatientLabAnalyzer {
  /**
   * Analyzes patient blood test results and generates diagnostic report.
   * @param patientId Unique identifier for the patient
   * @param hemoglobinLevel Hemoglobin concentration in g/dL
   * @param whiteBloodCellCount WBC count in cells/µL
   * @return DiagnosticReport containing analysis results
   * @throws InvalidParameterException if parameters are invalid
   */
  public DiagnosticReport analyzeBloodTest(
      String patientId,
      double hemoglobinLevel,
      int whiteBloodCellCount) {
    
    // Validate input parameters
    if (patientId == null || patientId.isEmpty()) {
      throw new InvalidParameterException("Patient ID cannot be null or empty");
    }
    
    // Check if hemoglobin level is within normal range (12-17 g/dL)
    boolean isHemoglobinNormal = hemoglobinLevel >= 12.0 && hemoglobinLevel <= 17.0;
    
    // Create and return diagnostic report
    return new DiagnosticReport(patientId, isHemoglobinNormal);
  }
}

public class LabChecker {
  // blood test checker - Sarah's code from 2019
  public String checkBlood(String pid, double hgb, int wbc) {
    if(pid==null) return null; // idk what to return here lol
    
    // hemoglobin check - normal is like 12-16 i think?
    // TODO: double check these ranges with Dr. Martinez
    if(hgb < 12) {
      System.out.println("LOW HGB ALERT: " + pid);
      // send email to nurse station
      emailNurse(pid, "low");
    }
    
    // wbc super high = infection maybe
    if(wbc > 15000) flagForReview(pid);
    
    return "ok";
  }
}