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Background: Parasitic infections can cause different chemical changes in human body. This study was designed to determine the liver aminotransferase changes in Iranian people infected by parasite.
Materials and Methods: In this cross-sectional study, blood samples were collected from 183 parasite-infected patients. After serum isolation in laboratory, Alanine aminotransferase (ALT) and Aspartate aminotransferase (AST) rates of all samples were measured according to IFCC standard method, and after recording in the information form, the results were analyzed using descriptive statistics.
Results: The results of this study showed that patients were infected by 19 different types of parasites. Also, the results showed that the average value ​​of ALT and AST in patients were equal to 32.30 ±23.40 and 38.60±34.80, respectively. The ANOVA test showed remarkable statistical differences between these values ​​and various infections. There was positive and significant correlation between ALT and AST.
Conclusion: The abnormality in liver function in patients with eosinophilia can be caused by parasitic infections in endemic areas; therefore, it can be the cause of a differential diagnosis for physicians.  Generally, non-significant changes in transaminase levels can also be attributed to the infection low intensity in patients tested.

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The effect of ovulation inducing LHRH-A₂ on sex steroids levels, stress indices and plasma biochemical parameters of the female sterlet, Acipencer ruthenus, were determined. The fish were injected intramuscularly with 10 μg/kg of LHRH-A₂ in two phases of in 10 and 90% at 12 hours interval. Blood samples were collected before injection (control), 12 hours after the first injection, and after the ovulation. Significant differences in the levels of testosterone (T), glucose and aspartate amino transferase (AST) concentrations were observed at the three samplings (P<0.05), but the levels of progesterone (P), 17β estradiol (E2), cortisol, alanine amino transferase (ALT), and total lipid did not change significantly (P>0.05). This study demonstrated that the injection of LHRH-A₂ has influence on liver enzymes activities and some hormones involved in final oocyte maturation. The results revealed that injection of LHRH-A₂ had  little impact on stress indicators, but some sex steroids such as T and blood biochemical parameters particularly AST were affected by hormonal induction.

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Aims: The aim of this study was to investigate the effect of dietary lemon peel (Citrus limon) essential oil on growth, hematological parameters, some of serum biochemical parameters and liver enzymes in rainbow trout (Oncorhynchus mykiss) juveniles. Materials & Methods: For this purpose, 144 rainbow trouts with an average initial weight of 95.05 ± 0.41 g were randomly stocked in four treatments containing different levels of lemon peel essential oil ( 0 (control), 200, 400 and 600 mg lemon peel essential oil/kg diet) and fed for eight weeks. Findings: The results showed the highest growth factors in treatments of 400 and 600 mg lemon peel essential oil/kg diet (p<0.05). Inclusion of essential oil in diet increased hematological parameters as compared to the control except MCV, MCH, MCHC and increased serum biochemical parameters by contrast to the control except glucose, triglyseride and cortisol (p<0.05). liver enzymes of ALT and AST showed no significant differences among treatments containing essential oil and LDH exhibited  no significant differences among 400, 600 mg essential oil/kg diet and the control treatment (p>0.05), but ALP amount significantly increased in essential oil treatments in a comparison to the control (p<0.05). Conclusion: Overall, these results indicated using 400 mg essential oil in rainbow trout diet could improve growth, hematological and some serum biochemical parameters of rainbow trout without any negative effects on liver.