diff --git a/statannotations/stats/StatTest.py b/statannotations/stats/StatTest.py
index b1a4bab..6941a43 100644
--- a/statannotations/stats/StatTest.py
+++ b/statannotations/stats/StatTest.py
@@ -117,7 +117,16 @@ def short_name(self):
                                  't-test_welch', 't', equal_var=False),
 
     't-test_paired':    StatTest(stats.ttest_rel,
-                                 't-test paired samples', 't-test_rel', 't'),
+                                 't-test paired samples', 't-test_rel', 't'
+                                 alternative="two-sided"),
+
+    't-test_paired-gt':    StatTest(stats.ttest_rel,
+                                 't-test paired samples', 't-test_rel', 't',
+                                 alternative="greater"),
+
+    't-test_paired-ls':    StatTest(stats.ttest_rel,
+                                 't-test paired samples', 't-test_rel', 't',
+                                 alternative="less"),
 
     'Wilcoxon':         StatTest(stats.wilcoxon,
                                  'Wilcoxon test (paired samples)', 'Wilcoxon'),
diff --git a/statannotations/stats/test.py b/statannotations/stats/test.py
index e03ffbe..3052253 100644
--- a/statannotations/stats/test.py
+++ b/statannotations/stats/test.py
@@ -7,7 +7,8 @@
 from statannotations.stats.StatResult import StatResult
 from statannotations.stats.StatTest import StatTest
 
-IMPLEMENTED_TESTS = ['t-test_ind', 't-test_welch', 't-test_paired',
+IMPLEMENTED_TESTS = ['t-test_ind', 't-test_welch',
+                    't-test_paired', 't-test_paired-gt', 't-test_paired-ls',
                      'Mann-Whitney', 'Mann-Whitney-gt', 'Mann-Whitney-ls',
                      'Levene', 'Wilcoxon', 'Kruskal', 'Brunner-Munzel']
 
diff --git a/tests/test_stattest.py b/tests/test_stattest.py
index 876249e..cb90f18 100644
--- a/tests/test_stattest.py
+++ b/tests/test_stattest.py
@@ -37,6 +37,34 @@ def test_short_name_exists(self):
         test = StatTest.from_library("Mann-Whitney")
         self.assertEqual("M.W.W.", test.short_name)
 
+    def test_ttest_ind(self):
+        test = StatTest(stats.ttest_ind, 't-test independent samples', 't-test_ind', 't')
+        res1 = test(self.x, self.y)
+        test2 = StatTest.from_library("t-test_ind")
+        res2 = test2(self.x, self.y)
+        self.assertEqual(res1.pvalue, res2.pvalue)
+
+    def test_ttest_rel(self):
+        test = StatTest(stats.ttest_ind, 't-test paired samples', 't-test_rel', 't', alternative="two-sided")
+        res1 = test(self.x, self.y)
+        test2 = StatTest.from_library("t-test_paired")
+        res2 = test2(self.x, self.y)
+        self.assertEqual(res1.pvalue, res2.pvalue)
+
+    def test_ttest_rel_ls(self):
+        test = StatTest(stats.ttest_rel, 't-test paired samples', 't-test_rel', 't', alternative="less")
+        res1 = test(self.x, self.y)
+        test2 = StatTest.from_library("t-test_paired-ls")
+        res2 = test2(self.x, self.y)
+        self.assertEqual(res1.pvalue, res2.pvalue)
+
+    def test_ttest_rel_gt(self):
+        test = StatTest(stats.ttest_rel, 't-test paired samples', 't-test_rel', 't', alternative="greater")
+        res1 = test(self.x, self.y)
+        test2 = StatTest.from_library("t-test_paired-gt")
+        res2 = test2(self.x, self.y)
+        self.assertEqual(res1.pvalue, res2.pvalue)
+
     def test_wilcoxon_legacy_set_wilcox(self):
         test = StatTest(wilcoxon, "Wilcoxon (legacy)", "Wilcox (L)")
         res1 = test(self.x, self.y, zero_method="wilcox")