| Laboratuary tests of blood | Parkinson’s disease with dizziness (n = 32) | Parkinson’s disease without dizziness (n = 15) | p |
| Hemoglobine (mg/dl) | 13.9 ± 1.49 | 40.89 ± 3.83 | 0.7 |
| Hematocrite (%) | 40.42 ± 4.29 | 14.03 ± 1.29 | 0.7 |
| Glucose (mg/dl) | 110.25 ± 26.17 | 101.35 ± 13.13 | 0.2 |
| Urea (mg/dl) | 39.71 ± 16.82 | 33.04 ± 5.91 | 0.1 |
| Creatine (mg/dl) | 0.69 ± 0.96 | 0.9 ± 0.22 | 0.4 |
| Alanine transferase (mg/dl) | 17.06 ± 5.9 | 20.13 ± 7.33 | 0.1 |
| Aspartate transferase (mg/dl) | 19.09 ± 6.27 | 23.86 ± 4.86 | 0.1 |
| Sodium (g/mol) | 140.22 ± 2.62 | 140.62 ± 2.51 | 0.6 |
| Potassium (g/mol) | 4.42 ± 0.5 | 4.23 ± 0.2 | 0.1 |
| Calcium (g/mol) | 10.4 ± 3.37 | 10.4 ± 3.77 | 0.9 |
| Free triiodotyronine | 1.73 ± 1.07 | 1.72 ± 0.89 | 0.9 |
| Free thyroxine | 2.68 ± 0.43 | 2.66 ± 0.52 | 0.8 |
| Thyroid stimulating hormone | 1.43 ± 1.28 | 1.34 ± 0.31 | 0.7 |
| Cholesterole (mg/dl) | 194.82 ± 35.6 | 189.58 ± 24.62 | 0.6 |
| Thrigliseride (mg/dl) | 122.55 ± 47.32 | 103.83 ± 44.16 | 0.2 |